RE: diffraction patterns or spectra
I have always used diffractogram(s). Doug Allen Sr. Mineralogist 928-792-5576 office 928-965-0500 cell From: Brian H. Toby [mailto:brian.t...@anl.gov] Sent: Thursday, February 11, 2010 8:56 AM To: amar...@chimica.unige.it Cc: rietveld_l@ill.fr Subject: Re: diffraction patterns or spectra diffraction patterns are often referred to as diffraction spectra. But we all know that diffraction is not a spectroscopic technique. A spectrum refers to a wavelength-dispersive measurement, while CW diffraction is spatially resolved. Either diffraction pattern or diffractogram is the choice of the cognoscenti IMHO, except perhaps in the case of TOF and energy-dispersive x-ray. Brian
Re: diffraction patterns or spectra
Daniel Chateigner a écrit : shall we say "spectra" is more general then ? since monocinetic measurements are never perfectly mono ? daniel We are allways working with idealized models ... Let's suppose that our monochromator is perfect! Radovan Radovan Cerny a écrit : > For single energy (single wavelength) experiment the correct term is > "diffraction pattern". For multi energy (energy dispersive, ToF) > experiment, the correct term is "diffraction spectrum". > > From http://www.etymonline.com/ : > > pattern (n.) > 1324, "the original proposed to imitation; the archetype; that which > is to be copied; an exemplar" [Johnson], from O.Fr. patron, from M.L. > patronus (see patron). Extended sense of "decorative design" first > recorded 1582, from earlier sense of a "patron" as a model to be > imitated. The difference in form and sense between patron and pattern > wasn't firm till 1700s. Meaning "model or design in dressmaking" > (especially one of paper) is first recorded 1792, in Jane Austen. > Verb phrase pattern after "take as a model" is from 1878. > > spectrum > 1611, "apparition, specter," from L. spectrum "appearance, image, > apparition," from specere "to look at, view" (see scope (1)). Meaning > "band of colors formed from a beam of light" first recorded 1671. > Spectroscope (1861) is a hybrid, with Gk. -skopion, from skopein "to > look at, examine," which is from the same PIE root as spectrum. > specter > > > Radovan > > > Lubomir Smrcok a écrit : >> Spectrum: >> from Latin >spectrum< appearance, specter, from >specere< to look, look at >> >> >> Lubo >> >> >> On Thu, 11 Feb 2010, amar...@chimica.unige.it wrote: >> >>> Dear all, >>> >>> I see that in scientific literature (also in high-impact factor scientific >>> journals) the diffraction patterns are often referred to as diffraction >>> spectra. But we all know that diffraction is not a spectroscopic technique. >>> Should we pay more attention on this aspect when we write or refer a paper? >>> What about? >>> >>> Best regards, >>> Alberto >>> >>> >>> >>> > > > -- > Radovan Cerny > Laboratoire de Cristallographie > 24, quai Ernest-Ansermet > CH-1211 Geneva 4, Switzerland > Phone : [+[41] 22] 37 964 50, FAX : [+[41] 22] 37 961 08 > mailto : radovan.ce...@unige.ch > URL: http://www.unige.ch/sciences/crystal/cerny/rcerny.htm > > > Ce message a ete genere avec le webmail Horde-IMP de l'ENSICAEN. -- Radovan Cerny Laboratoire de Cristallographie 24, quai Ernest-Ansermet CH-1211 Geneva 4, Switzerland Phone : [+[41] 22] 37 964 50, FAX : [+[41] 22] 37 961 08 mailto : radovan.ce...@unige.ch URL: http://www.unige.ch/sciences/crystal/cerny/rcerny.htm
Re: diffraction patterns or spectra
diffraction patterns are often referred to as diffraction spectra. But we all know that diffraction is not a spectroscopic technique. A spectrum refers to a wavelength-dispersive measurement, while CW diffraction is spatially resolved. Either diffraction pattern or diffractogram is the choice of the cognoscenti IMHO, except perhaps in the case of TOF and energy-dispersive x-ray. Brian
Re: diffraction patterns or spectra
shall we say "spectra" is more general then ? since monocinetic measurements are never perfectly mono ? daniel Radovan Cerny a écrit : > For single energy (single wavelength) experiment the correct term is > "diffraction pattern". For multi energy (energy dispersive, ToF) > experiment, the correct term is "diffraction spectrum". > > From http://www.etymonline.com/ : > > pattern (n.) > 1324, "the original proposed to imitation; the archetype; that which > is to be copied; an exemplar" [Johnson], from O.Fr. patron, from M.L. > patronus (see patron). Extended sense of "decorative design" first > recorded 1582, from earlier sense of a "patron" as a model to be > imitated. The difference in form and sense between patron and pattern > wasn't firm till 1700s. Meaning "model or design in dressmaking" > (especially one of paper) is first recorded 1792, in Jane Austen. > Verb phrase pattern after "take as a model" is from 1878. > > spectrum > 1611, "apparition, specter," from L. spectrum "appearance, image, > apparition," from specere "to look at, view" (see scope (1)). Meaning > "band of colors formed from a beam of light" first recorded 1671. > Spectroscope (1861) is a hybrid, with Gk. -skopion, from skopein "to > look at, examine," which is from the same PIE root as spectrum. > specter > > > Radovan > > > Lubomir Smrcok a écrit : >> Spectrum: >> from Latin >spectrum< appearance, specter, from >specere< to look, look at >> >> >> Lubo >> >> >> On Thu, 11 Feb 2010, amar...@chimica.unige.it wrote: >> >>> Dear all, >>> >>> I see that in scientific literature (also in high-impact factor scientific >>> journals) the diffraction patterns are often referred to as diffraction >>> spectra. But we all know that diffraction is not a spectroscopic technique. >>> Should we pay more attention on this aspect when we write or refer a paper? >>> What about? >>> >>> Best regards, >>> Alberto >>> >>> >>> >>> > > > -- > Radovan Cerny > Laboratoire de Cristallographie > 24, quai Ernest-Ansermet > CH-1211 Geneva 4, Switzerland > Phone : [+[41] 22] 37 964 50, FAX : [+[41] 22] 37 961 08 > mailto : radovan.ce...@unige.ch > URL: http://www.unige.ch/sciences/crystal/cerny/rcerny.htm > > > Ce message a ete genere avec le webmail Horde-IMP de l'ENSICAEN.
R: diffraction patterns or spectra
Dear Alberto, I agree with you, but there are also 'great' professors of crystallography that say "powder diffraction spectra". Davide -Messaggio originale- Da: amar...@chimica.unige.it [mailto:amar...@chimica.unige.it] Inviato: giovedì 11 febbraio 2010 14.52 A: rietveld_l@ill.fr Oggetto: diffraction patterns or spectra Dear all, I see that in scientific literature (also in high-impact factor scientific journals) the diffraction patterns are often referred to as diffraction spectra. But we all know that diffraction is not a spectroscopic technique. Should we pay more attention on this aspect when we write or refer a paper? What about? Best regards, Alberto
Re: diffraction patterns or spectra
For single energy (single wavelength) experiment the correct term is "diffraction pattern". For multi energy (energy dispersive, ToF) experiment, the correct term is "diffraction spectrum". From http://www.etymonline.com/ : pattern (n.) 1324, "the original proposed to imitation; the archetype; that which is to be copied; an exemplar" [Johnson], from O.Fr. patron, from M.L. patronus (see patron). Extended sense of "decorative design" first recorded 1582, from earlier sense of a "patron" as a model to be imitated. The difference in form and sense between patron and pattern wasn't firm till 1700s. Meaning "model or design in dressmaking" (especially one of paper) is first recorded 1792, in Jane Austen. Verb phrase pattern after "take as a model" is from 1878. spectrum 1611, "apparition, specter," from L. spectrum "appearance, image, apparition," from specere "to look at, view" (see scope (1)). Meaning "band of colors formed from a beam of light" first recorded 1671. Spectroscope (1861) is a hybrid, with Gk. -skopion, from skopein "to look at, examine," which is from the same PIE root as spectrum. specter Radovan Lubomir Smrcok a écrit : Spectrum: from Latin >spectrum< appearance, specter, from >specere< to look, look at Lubo On Thu, 11 Feb 2010, amar...@chimica.unige.it wrote: Dear all, I see that in scientific literature (also in high-impact factor scientific journals) the diffraction patterns are often referred to as diffraction spectra. But we all know that diffraction is not a spectroscopic technique. Should we pay more attention on this aspect when we write or refer a paper? What about? Best regards, Alberto -- Radovan Cerny Laboratoire de Cristallographie 24, quai Ernest-Ansermet CH-1211 Geneva 4, Switzerland Phone : [+[41] 22] 37 964 50, FAX : [+[41] 22] 37 961 08 mailto : radovan.ce...@unige.ch URL: http://www.unige.ch/sciences/crystal/cerny/rcerny.htm
Re: diffraction patterns or spectra
Spectrum: from Latin >spectrum< appearance, specter, from >specere< to look, look at Lubo On Thu, 11 Feb 2010, amar...@chimica.unige.it wrote: Dear all, I see that in scientific literature (also in high-impact factor scientific journals) the diffraction patterns are often referred to as diffraction spectra. But we all know that diffraction is not a spectroscopic technique. Should we pay more attention on this aspect when we write or refer a paper? What about? Best regards, Alberto
diffraction patterns or spectra
Dear all, I see that in scientific literature (also in high-impact factor scientific journals) the diffraction patterns are often referred to as diffraction spectra. But we all know that diffraction is not a spectroscopic technique. Should we pay more attention on this aspect when we write or refer a paper? What about? Best regards, Alberto
